it is said that there have been many changes ___in my hometo

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it is said that there have been many changes ___in my hometown in the last ten years.
A.happened B to happen C happening D happen
我看到大家多选择C.如果正确答案就是C,那么changing在这里是什么用法?

答案C是对的,因为前面已有动词have been
句型：THERE BE +名词+DOING STH ‘有……正在做……‘
再问：既然已经是there have been ，不可以是happened表示已经发生过了吗？
再答：不行记住：THERE BE +名词作主语（看到MANY CHANGES 了吗？），另外，HAPPEN 是不及物动词没有被动语态。

it is said that there have been many changes ___in my hometo It is said that recently there have been some people who wan it‘s reported that there have been great changes in that tow there have been many changes in ______（recently）years 利用提示写一篇短文,说明你生活中的变化.There have been many changes in my life there have been great changes in my hometown_________(resent He is said to have been there it's said that there have been several new evens-----the pro In the past few years,there ______great changes in my hometo There have been many change in Beijing.(同义句）Many changes ___ it has been said that there is no such thing as a sustainabl There have been many changes in this place.这句中为什么用have?主语是什么